Hello, everyone.
The engine is generally healthy and what bugs me the most, has JUST been overhauled by a good mechanic, which included cleaning the carb, after which it started on 1-3 pulls and ran like magic.
Today I went fishing for the first time after not using the boat for about 3 weeks. The engine started fine (with 2/3 choke), I let it warm up a bit, with little-to-none choke. Idle was a tiny bit rough, but nothing major. When I set it on idle for the first time, it ran for about 3 minutes and died. Since then I could only start it with either choke or some throttle and it'd always die quite soon on idle or close to idle. When I try to start it warm with no choke, it'd sound as if it catches and dies off immediately.
The plugs are 1 month old and adjusted, oil's in order, no detectable problems with the prop or anything else.
I have a suspicion it might be either condensate or some grit in the fuel tank, which was stored in a rather damp place for 3 weeks, half full (although tightly closed). What should I check and is there a way to condition the fuel somehow to remove condensate and clean out eventual b/s from the carb without major mechanical work (I really don't want to pull the boat ashore before autumn)?
Thank you!
SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60
Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.
SOURCE: does my 2000 honda 4 stroke 8 hp outboard have a fuel filter?
Your tech may have missed one or two parts of the idle circuit. There is an idle mixture screw hidden under a brass plug (to prevent tampering on the top of the carburator. This passage needs to be cleaned and idle air mixture screw adjusted properly.
There is also an idle air jet located close to the idle mixture screw. The jet should be removed and cleaned as well as the passage that it came out of. The jet is a small brass piece with a small hole and a standard screwdriver slot. Unscrew this, spray brake cleaner through the little holes and spray brake cleaner (using the little straw that comes with the brake clean) into the hole in the carburator. Take some compressed air ( from a small can of compressed air that you use to clean your computer) and spray into the hole. Reinstall the jet and see what happens. If this does not fully fix it, I would return it to whomever originally cleaned it. If the dealer is worth their salt, they will fix it (if they did not clean in the first place) Everybody makes mistakes.
Also, be sure that your oil level is not too high. It is better to be a little low than too high.
Be sure to be using NKG spark plugs DR5HS I assume that both spark plugs look ok.
The other item that affects this motors idle is the thermostat. Feel the top head of the motor. It should be about 130 degrees. Not hot enough to only just touch, but not cool enough to be able to keep you hand on for 10 seconds or more. A temperature gun would tell you for sure, but most people do not have those is their back pocket.
Timing could be an issue, but normally, it would affect all speeds of operation.
A lot of things for such a little motor.
SOURCE: tune up specs for honda outboard
You have probably already found an answer, but all the specs are in the owners manual. If you do not have one, you can download one for free from honda-marine.com under the owners section. You will only need the serial number for your engine.
SOURCE: 1984 mariner 5hp two stroke outboard wet sparkplug
Then it is flooding itself. You need to rebuild the carb and check your float level. Make sure to replace the needle and seat also because when they wear it will cause the engine to flood. I am 98% sure that will fix your problem!
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Check for fuel pressure or clean the carburetor clogs, power valve,
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